<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>背景重复和尺寸定制</title>
  <style>
    article {
      width: 800px;
      height: 200px;
      background: repeating-linear-gradient(90deg, blue, 25px, yellow 25px, 25px, red 50px);
    }

    aside {
      width: 200px;
      height: 200px;
      background: repeating-radial-gradient(100px 100px, red 0%, yellow 40%);
    }
  </style>
</head>

<body>
  <aside></aside>
  <article>
  
  </article>
</body>

</html>